System.OutOfMemoryException: 引发类型为“System.OutOfMemoryException”的异常。
在 System.Collections.Generic.List1.set_Capacity(Int32 value) 在 System.Collections.Generic.List1.EnsureCapacity(Int32 min)
在 System.Collections.Generic.List`1.Add(T item)
在 TestWFApplication.Form1.OnSaveToDB(Int32 nDataCount, Single[] pfltData, Int32 nSelGroupID, Int32 nChannelNO)
每隔一秒取数据写入缓存中，然后在从缓存中读取保存在文本文件里。
1.开启一个线程
public void tets()
{
InitializeChart();
Thread myThread = new Thread(GetDataThread);
myThread.IsBackground = true;
myThread.Start();
m_startTime = DateTime.Now;
//请定时发送
System.Windows.Forms.Timer timer1 = new System.Windows.Forms.Timer();
timer1.Interval = 1000;
timer1.Enabled = true;
timer1.Tick += new EventHandler(timer1EventProcessor);
}
2.获取数据
public void GetDataThread()
{

        int nBufferSize = 1024 * 1024;
        IntPtr pBuffer = Marshal.AllocHGlobal(sizeof(float) * nBufferSize);
        while (this.m_bThread)
        {
            int nTotalDataPos, nReceiveCount, nChnCount, lReturnValue;
            axDHTestHardWare2.GetAllChnData(nBufferSize, (int)pBuffer, out nTotalDataPos, out nReceiveCount, out nChnCount, out lReturnValue);
            if (nReceiveCount <= 0)
                continue;
            float[] pValue = new float[nReceiveCount * nChnCount];
            Marshal.Copy(pBuffer, pValue, 0, nReceiveCount);
            for (int k = 0; k < nChnCount; ++k)
            {
                float[] BufferPoint = GetChannelData(nSelGroupID, k, pValue, nReceiveCount);
                this.BeginInvoke(new OnShowSampleDataDelete(OnShowSampleData), BufferPoint.Length, BufferPoint, nSelChanID, k);
            }

            Thread.Sleep(1000);
        }
        Marshal.FreeHGlobal(pBuffer);
    }

3.写入缓存
void OnSaveToDB(int nDataCount, float[] pfltData, int nSelGroupID, int nChannelNO)
{
string keyText = CacheData.GenKey(nSelGroupID, nChannelNO);

        SendWriteLock.EnterWriteLock();
        if (m_cacheData.ContainsKey(keyText))
        {
            for (int i = 0; i < nDataCount; ++i)
                m_cacheData[keyText].cacheList.Add(pfltData[i]);
        }
        else
        {
            CacheData data = new CacheData();

            data.nGroupID = nSelGroupID;
            data.nChannelNO = nChannelNO;
            data.startTime = m_startTime;
            data.nSecond = 0;
            for (int i = 0; i < nDataCount; ++i)
                data.cacheList.Add(pfltData[i]);
            m_cacheData.Add(keyText, data);
        }
        SendWriteLock.ExitWriteLock();
    }